It would be nice to be able to adjust brightness level on a desktop monitor just like one does with laptops, turns out you actually can.
Using the Display Data Channel or DDC, brightness level can be adjusted from the standard Gnome brightness controls. This is implemented in the following kernel module
https://gitlab.com/ddcci-driver-linux/ddcci-driver-linux
and the wiki for Fedora 31 is here
https://gitlab.com/ddcci-driver-linux/ddcci-driver-linux/issues/12
Research sources for the wiki issue
https://unix.stackexchange.com/a/546329 https://docs.fedoraproject.org/en-US/fedora/rawhide/system-administrators-guide/kernel-module-driver-configuration/Working_with_Kernel_Modules/#sec-Persistent_Module_Loading
Addendum: This article needs to mention what are the hardware limitations if any.
Metadata Update from @glb: - Issue tagged with: article
Metadata Update from @glb: - Issue assigned to anothergituser
On Dec 13, 2019 anothergituser commented:
From wikipedia, DDC was first introduced in 1998 and later revisions added support for HDMI in 2004 and DisplayPort in 2007. As for other issues this is quoted from wikipedia "Some KVM switches (keyboard-video-mouse) and video extenders handle DDC traffic incorrectly"
I'm using this with an LG 24UD58 monitor, maybe from 2016
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